This is emphatically one of the dog-days. A dense fog
and the clouds (which did not let in any sun all day)
were the dog-day fog and mist, which threatened no rain.
A muggy but comfortable day.
As we go along the corner road, the dense fog for a
background relieves pleasantly the outlines of every tree,
so that each is seen as a new object.
source: Henry David Thoreau, Journal July 31, 1859
image: Eddie’s Image Collection, Summer Fog